1281057421 has 12 divisors (see below), whose sum is σ = 1493691840. Its totient is φ = 1095483480.

The previous prime is 1281057403. The next prime is 1281057433. The reversal of 1281057421 is 1247501821.

It is not a de Polignac number, because 1281057421 - 2²⁷ = 1146839693 is a prime.

It is a super-2 number, since 2×1281057421² = 3282216231798342482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281057451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9211 + ... + 51448.

It is an arithmetic number, because the mean of its divisors is an integer number (124474320).

Almost surely, 2^1281057421 is an apocalyptic number.

It is an amenable number.

1281057421 is a deficient number, since it is larger than the sum of its proper divisors (212634419).

1281057421 is an equidigital number, since it uses as much as digits as its factorization.

1281057421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61104 (or 61097 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 1281057421 is about 35791.8624969420. The cubic root of 1281057421 is about 1086.0659520716.

The spelling of 1281057421 in words is "one billion, two hundred eighty-one million, fifty-seven thousand, four hundred twenty-one".